| /* |
| ** Copyright 2010, The Android Open-Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| #ifndef _AUDIO_H_ |
| #define _AUDIO_H_ |
| |
| struct pcm; |
| |
| #define PCM_OUT 0x00000000 |
| #define PCM_IN 0x10000000 |
| |
| #define PCM_STEREO 0x00000000 |
| #define PCM_MONO 0x01000000 |
| |
| #define PCM_44100HZ 0x00000000 |
| #define PCM_48000HZ 0x00100000 |
| #define PCM_8000HZ 0x00200000 |
| #define PCM_RATE_MASK 0x00F00000 |
| |
| #define PCM_PERIOD_CNT_MIN 2 |
| #define PCM_PERIOD_CNT_SHIFT 16 |
| #define PCM_PERIOD_CNT_MASK (0xF << PCM_PERIOD_CNT_SHIFT) |
| #define PCM_PERIOD_SZ_MIN 128 |
| #define PCM_PERIOD_SZ_SHIFT 12 |
| #define PCM_PERIOD_SZ_MASK (0xF << PCM_PERIOD_SZ_SHIFT) |
| |
| /* Acquire/release a pcm channel. |
| * Returns non-zero on error |
| */ |
| struct pcm *pcm_open(unsigned flags); |
| int pcm_close(struct pcm *pcm); |
| int pcm_ready(struct pcm *pcm); |
| |
| /* Returns a human readable reason for the last error. */ |
| const char *pcm_error(struct pcm *pcm); |
| |
| /* Returns the buffer size (int bytes) that should be used for pcm_write. |
| * This will be 1/2 of the actual fifo size. |
| */ |
| unsigned pcm_buffer_size(struct pcm *pcm); |
| |
| /* Write data to the fifo. |
| * Will start playback on the first write or on a write that |
| * occurs after a fifo underrun. |
| */ |
| int pcm_write(struct pcm *pcm, void *data, unsigned count); |
| int pcm_read(struct pcm *pcm, void *data, unsigned count); |
| |
| struct mixer; |
| struct mixer_ctl; |
| |
| struct mixer *mixer_open(void); |
| void mixer_close(struct mixer *mixer); |
| void mixer_dump(struct mixer *mixer); |
| |
| struct mixer_ctl *mixer_get_control(struct mixer *mixer, |
| const char *name, unsigned index); |
| struct mixer_ctl *mixer_get_nth_control(struct mixer *mixer, unsigned n); |
| |
| int mixer_ctl_set(struct mixer_ctl *ctl, unsigned percent); |
| int mixer_ctl_select(struct mixer_ctl *ctl, const char *value); |
| void mixer_ctl_print(struct mixer_ctl *ctl); |
| |
| #endif |